Carrier CDII-184R1-0CTR4 Installation & Operation Manual page 22

7. Flare end must not have any burns or imperfections.
8. The length of the flared walls must be uniform.
7.3 PIPES CONNECTIONS
1. Align the centers of the connecting pipes.
2. Tighten the flare nut as strong as possible with your fingers (Below table if for reference
only)
Flare Nut size in INCH
Flare Nut size in mm
Torque (Nm)
3. Fix nut with a spanner & tighten it with torque wrench.
4. As shown in below figure, use two spanners to unscrew or tighten the valve flare nut, at gas
side. If using a single spanner, the nut cannot be tightened with necessary tightening torque.
On the contrary, use single spanner to loosen or tighten the flare nut of the valve at liquid
side.
5. Protect the open end of the pipe against dust and moisture.
6. All pipe bends should be as gentle as possible. Use a pipe bender for bending.
Since in the Unit Both Compressor & Suction Line are in Indoor. It fully complies general
guideline of Suction line. The cross-section of horizontal suction lines shall be such that the
resulting gas velocity is at least 4 m/s. Suction lines are insulated to limit suction gas superheat.
Filter Drier – Flare nut Max. Tightening Torque
¼"
6mm
20
3/8" ½"
10mm 12mm
30 60
22
5/8" ¾"
16mm 18mm
100 200